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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8354603cda320ee15eda745c9c3e8aaad88d587eb214c07b507d29ebb7476125' 
  AND token = 'tgC9SiB1n6dXZ1pFtr3GZWaxkR87UF0EBLRR7mbz1e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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