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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f316ae2f95a481588d42aecd67f266128df7f6552dab03f51dff79297bfb0adf' 
  AND token = 'DJ4/thCX1QsTEwIG0wsQTh8m+71h81D754v0jPxdtAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}