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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cacebcca12c1b9b484d3329e60440e445c90b6965148f0ce15ef91e383aca4b1' 
  AND token = 'edhCcMyEaBFwtOoL5dUOBKZ7hP8B+XI7Y23nNfI0cqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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