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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85bbc3b68211e34d0b3af277bb1afc717f4f5df8715bb91e443a0d915c2142c' 
  AND token = 'qyX/n3yDV+dw8r6ecYxJxb4sUdn+wf71hoa8jNo/g6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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