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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bce37c55bbe6c02d912c52f5d7b69a490f76982c2dcc0c5fada73d0a8f5aae8' 
  AND token = 'SLY/dZI8KJ+Od30MteoQLp8/C6XBIYvhQom+NtoxmZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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