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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6002fa5dfceadb84bcae72d89b8bb280fdcca02f14eb948a80a23bafe2badc99' 
  AND token = '4FaczhE3oQrGejfDpX1Xd5qe2PstKaxeJQm+15Sffxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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