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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a8a44634ed8fcc7c8fcc13b9f28f21b7ef2fac8e961f3b4e02d6e493145f687' 
  AND token = 'Z3ddWLLijmLa6C1qg6HN4rg0OXF+xK5m+C2AbFPc31k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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