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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acdd8ea7bc9257dd3daa9bf7f237c73e6e09d201e27588ea7c9297feef2b182d' 
  AND token = '13WU/DGtzwPdTzGIKmB8u+oFwFR7hw8Tk5svG2gbaBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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