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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde8bade97f3fd3dadb09addd5324ff573aa5a2a9bbedbd38962e81f95e03e24' 
  AND token = '8KN/MvOLH+R12y+9PYE7ZuS3O+Qb53hu/MFSlVnk9l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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