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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ab6a76696f08110c7104b416b402cceaea4af0d5e6ea1f9a8e3b99a8bf5631' 
  AND token = 'XqyhbkmGShqn8aRG2KYdSQva5IusmefgLqmV5kGlffc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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