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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027524672a13484c562ffffb02e71db82814151366a1178490434d5a4b46f0b8' 
  AND token = '2GxFRMRAKdz3vhauKdkEX5+bA4w7vwO3DsB+WSmdn7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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