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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb3eb4d8d55a3b59632d01d88f50afccdfe22ddb43ca07ec03dafdfe768e08b' 
  AND token = 'LEzZZ7wQnvBMG/phsaYysUywl/d2miy308/rGFRbGew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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