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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f62ec535e6c23cdb447cb985c6b513d01f2bcfe050fb4a9b28d0617054fd28d' 
  AND token = 'R4jMRL4lksEOGcsJ93HNgbdmJa/obvJYACS12nj/6+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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