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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be9bb040407cb149d3520a9d1b8315a50323cdf5788b547e2a31d6ced3bafe6' 
  AND token = '9IycTj9Fz6FY9HBC1GDa86naEOPRdaJEtZheZWr1MGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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