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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f74a2e43088fe1a9a448e25f4fc2b80d2d5a31652f8dc51f23c9872c27957d3' 
  AND token = 'BhVSWIkv7+0uWttL666Q/QqvvlRRC8aIpESio0eTW/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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