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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a94b3b46fe267cbfc9f84800697548b407553f12a1b467acb9f224e1927127' 
  AND token = 'swKDIotcMFelHRDSETLIdas8TDfyBh4O8JQZr1NIC5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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