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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c55c31a09887b9043ae80218587e10ba924c02e761e63c10959cfeb22ac9d9d' 
  AND token = 'SGITU+UF588FDK30qLt1cEb0rk+QvbygUV+ikgcKQ/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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