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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d30a04b0f744c2ebfbd52612aeaf4d2412a91792a349cab4e3765c2b029998' 
  AND token = 'NRQUR1NU9o2kNt86AnDxTLiuDzb96lTyBOK+EEXiAsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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