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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab0c38205ee397c399a78c6f9631f92a6772631c9ac99418ecd9435af95d247' 
  AND token = 'zkZpJOTU+Y7bF230nQsuFtWJu8FAQCm6+D3CZmCX6kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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