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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9abc1f3b209639435dd3be105dbade5bb1d67049cc6171e8797e904be4768ed' 
  AND token = 'ceg+Yx6WdnTp901abq+HOmb4SpbBC0g0FbUEXw588oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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