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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eedbfeab4cce0c3cf918e5f1d26a201dc4d96a1f1efbf05812fc5f2ba15353cb' 
  AND token = 'UXwzoH0JDqm3GcDZjHCHLfi5aEjmO+e2hSj82aL2e7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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