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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5724b4a4afd6392ebf5de36a70ad9b59ade2478095f5278f57c9579593b10c8c' 
  AND token = 'QSu/+M5TexoXrD6L3DBKzLrOc/mYKAaT/xUCK1fsaS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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