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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb010c94d2633fa9e1799bdd3b50c05528a8d3f6c13e96038b631133c5011613' 
  AND token = 'HnQw391xlsr+8Gt8+TYwDIv8StPu+mUQBvwx35sAkK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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