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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebefb972924c5c0aee321b9ec8b334517d0417a1dd599840d41862ebeae796ef' 
  AND token = 'eA0uIMkRz/37ZGik8B1s5N21lW/GL4KdRR+O1BKIBHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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