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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e40061f08ed86f44b6849c7fa4a9f9165c9c8d1ee7c407c96d1bbd5fdbb9b8f' 
  AND token = 'NFY6l76+jHDi4dd/ygH23LkZ7nVWIRlP+2PouGN5WYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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