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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebdcfda2979ce978082b3e8464417e7f79c90059efbed8dde8187b9ae335a3c' 
  AND token = 'zYDCIwZSe5WdpXIl1XfaDwwZokxcFD2oq4HB3WEMs4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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