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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4ca241a1956802c4970a0af2d28736cedc6f6b21adc151ce2930f6a5ddfa75' 
  AND token = 'j3O7JjfkJlcFa8WRMcHr/eN6hX8kcdcWXAhQ52Bposo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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