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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6b4cf088b835b5fddc822324003d288e8c54d64a8d6b72cb69b11c2a0f3f56' 
  AND token = 'cihx+j2rHNV+0frxpSosYFLcrVANUQXGkzGd3lHfS2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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