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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98dcd90ee2066ac8eb643907927fca8e89ca69c516c1a9e76c2f1c988631591a' 
  AND token = 'RZsAR3C8oAY7nTYRoL+HQ5o6AY/HO7KURy3Lmv+c3ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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