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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de12f8519cdf8aeddc604f76eeaab28dc66401dcf7d2cd5aff9bb548fefad216' 
  AND token = 'l86LTdX5HLVVcnBECcXx2B+43zi4Is9ce8wbke7B+as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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