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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5342c6bd159aa73ef1e20f65da5a51cd67be1c5b6b9118c14456650ea8516c5' 
  AND token = '1eaZHqqMjlbCXkfPVwA9GeiAP16AX6cQPFAthMXtCWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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