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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ff12d46d35d02c9f4194cee82defe95ca8e238a69adc6ba58c035508c4a2dd' 
  AND token = 'eNOwjwJaC57A1l+QSHwrPM7V2AcJtMp/Og2zaSJvaqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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