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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95df28ff792ee1c5110b95b4308da5e75eb9c8d2dd306ea41d21d482736d529e' 
  AND token = 'z/SFtXPruIaVAV2wa35boZVhBXHfTfRQiYyzjH3InNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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