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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b20804c1f943dea230bf6efe830536d86763a1c4fb86a9ef8a86dd8c46814c' 
  AND token = 'A1i0Vt0DwhitYLuMLCI+eHqs2UQreSKRGFu4jFDetAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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