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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36f8b3a94ba62b22371c7fa39b09fac25d42061d86d4da6a608b6fcd8473e79' 
  AND token = 'sZxFTY4RiBXAGEwVGY6acrokQX6X6OvXt3piEuC2R2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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