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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0538ad05ae5fc994430a3901edbb7310f2d5fa6a16fe2ab20a9c81e176624d' 
  AND token = 'R1PtI+iF4O29NrPCsuUwABigj2qDKM3BvZsp8/5r6sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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