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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7177ddb6e11259fbe7fdb2fcfc39614989c6044dd51b962d9bfaff1a695e59b' 
  AND token = 'h2sJtd0q5OmnVL7yWb3vtwg4AVI/MlEDtW6kVDX+gZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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