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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea68d6672a39531a243018b8cfa942c723c0e227b6cdb2d12cf823812d073119' 
  AND token = 'bocazaHDL7donytEJ7VGLts1eUjkyWJLxlBWr9XfB4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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