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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba54cf6f7015cf0f767f144649e88a9c662a6f5675cec94c0cca32f7dc9c322' 
  AND token = 'd2r7Q3JoEkUtZOcgK2VhVnHDASWVArdUD6+8T2TzxeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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