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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7bfccff4812e1fdfa56fcd6d0420ce037b88e4e9ecf00767f736184db8e023' 
  AND token = 'mGFDGgJr6kCu/F7d1a0GN11/KP0g7Cs8BnKjt6VsnlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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