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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6946946fc4f760bff0ff8a28fc949da9f8838a24fa03323b27defe3f15fe1955' 
  AND token = 'nzNRp0ihfIMbc6jo98To3ad3B++LLFm5pBVR4u3bXRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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