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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238c525250807e6d1e2a79f5d421b6bf0541c0d93a668e30edeb470b1f260db7' 
  AND token = 'XeS9Br5i/OLVJNjwbJI1rEU7EM9yWePcN1P5nF/iC+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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