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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552f9812f778482f9103d74a81b12ec5cd2901dcbfe17f2108eca72c942baf95' 
  AND token = 'iLs6CvorFrSxvsHhtL9VGIPMJtoYdoIuGGIZcX6KMGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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