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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577e6f7eefd614432760c26c1d3814ffad7f35932736d47a7cfdc34cab14543e' 
  AND token = 'fHo/w4/3QvAs1ss0Ga3EewsDDwwCg5jJEWLYzTS7x4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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