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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb47ce814bb2e8e30d5e651073c141b4ee2702be5dd00f6ecf3ecd954c964c6b' 
  AND token = 'z4TrB2NL/3dmprltIylNF+mY0KrpFE2MaNWdLs74LZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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