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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b182ae4da2e7dee374c4cee72faeec442854e098b0e518cb602e299137f55025' 
  AND token = '0Sp6pKwTeY97gfCt0BAJirpiIun2PumW34rg6pW+OCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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