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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cabc254adaaf9844c268d3fa66428a10afeec3e1e07d5e2810e0d80ef3eaa2d' 
  AND token = 'F+HfbuHOuXr6LhsVAYL6uBJKqiqiT/2u3Q+oV+YY0cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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