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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead5a379f020fd58f187b0105641b04a2e29aa05fde5b3a82a83a735a63493dc' 
  AND token = 'EQia9Oq4JvDJ8lgq18MK2euzsagFQYaTKDKMeRkEULY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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