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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3fda272b6f6a9bd47196ce3a97a99e5057453fc2c9fa9b2dbe0b6c1217c40e' 
  AND token = 'mKGm+UI/J1cviUbwFXG49MjPAxMCe6vfdEUUO+rKBnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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