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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add82a427e3c6a162f4aa4ae02dc0bb0561876efe2d77c8505fcb6b17e7289a0' 
  AND token = '0NdE2xTP4abd/jN45Lo5XBABibsOrPlsq+2fb/e7yJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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