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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1668a1264baa52ff69d8e2c4a27173e4c304dbd6ca40ea86f25a8f981047ec8b' 
  AND token = '6lkOvdFC1RmE0LNit1E7dJJzTsdibGLqw5x7QopR2cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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