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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1cc7675cfd2111e3461b59d3f387f49a0af902e8b4ecdd2d7dfc32ef0b970dd' 
  AND token = '+zLlGHNNgcaK3VOovWeQ1C09yBPKhoBOhgCxt4Onshc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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