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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db67144eb5a2ae3860a0d2ee44f109795bc5c27b9dfb3fbe39e8e23b2b6dd1a' 
  AND token = 'DYv88xCPioRN+paPFPWsuTjYajG6+c2gCnSHL1FlFXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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