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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e76088bf8494904244499e8189be9a6186c71eab98d577eb244ed0047e20fa' 
  AND token = 'akyI3l3g78iz6ZF61H8e/BB7CdPsmpTjgPoBGY3zUEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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