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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc1a42c56f69df14ed9a0a5453c22d4f36627b31fe4ac05b145c44b24e60f22' 
  AND token = 'fPFpS4i4NPUmElgte3M4t+Hofet2iNbqTF83RUi87XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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