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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b76344073c9bb8222799bce194fcb3e5752b187c0c28a94812d6780a2d0be4d' 
  AND token = 'lKlNZi5PmV4NMklHZzjNSnQGWgRAfRR0RamcFeEL+iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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