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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb7c95bdcd88e68e29eaeef18bc8c67a3fb9da99069a97f1ff5ea79d3907bc1' 
  AND token = 'DJd5nM3B5OZOeTEuFSP/rRtXMWmb5/A/ivyTDBhadS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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