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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed7d6f9bfbbd338694c36ba06a480c22626e613cb67b7496042cd0238be3a62' 
  AND token = 'CUJq14/dxQ0hD3xpIxh3RdivDJJEv1Vg4oET9rfihHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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