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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eff9c53f21d487fa3a898b16034ebebfe8bece742cddcef09a7feaa6eb1fedb' 
  AND token = 'kQLgK2E7O5t1ADPSR5E3PovD3eUFBkwwqrK7c5kIKCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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